New to the forum and to the gto I bought it on a week ago and have noticed both times I filled it up the damn gauge don't go up all the way the pump clicks like its full but the gauge is still a line from full. Is this a cluster problem I been reading or is my fuel sys?

Dealer tech2 can test gave sweep... After that, you'd have to get into wiring or componentry to find issue. Where in Cali are you?

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